Our Pneuma-Seal® inflatable profiles and other specialty rubber products are available in a wide variety of materials as noted below. Availability of specific elastomers vary from one profile to another. This information can be found in the Pneuma-Seal Standards section with the applicable profile's Available Materials tab.
For a special charge, cross sections can be custom made using materials other than those indicated in the Pneuma-Seal Standards section. Please note the ratings given to the properties of the elastomers are based on Pawling EP's compounds as they are applied to our inflatable and other compression seal products. The ratings of other manufacturers may differ as the result of compounding variables and end product use. Also note the addition of fabric reinforcing overcomes drawbacks associated with some of the relatively poor physical characteristics of silicone, fluorosilicone, fluorocarbon rubber, and nitrile.
| "Common Name” Base Polymer |
EPDM or EP Rubber |
Neoprene | Nitrile or Buna-N |
Natural Rubber |
Butyl | Silicone | Fluoro- silicone |
Fluoro- carbon |
|---|---|---|---|---|---|---|---|---|
| Chemical Name | Ethylene Propylene |
Chloro- prene |
Acrylonitrile Butadiene |
Natural Isoprene |
Isobutylene Isoprene |
Silicone | Fluoro- silicone |
Fluoro- carbon |
| ASTM Designation (ASTM D1418) | EP | CR | NBR | NR | IIR | VMQ | FVMQ | FKM |
| Tensile Strength (psi) | >2000 | >2000 | >2000 | >2000 | >2000 | >1200 | >1200 | >1400 |
| Hardness Range (Durometer A) | 40-90 | 20-80 | 50-95 | 50-70 | 40-75 | 40-80 | 40-70 | 70-90 |
| Tear Resistance | G | G | F | G | G | F | P | F |
| Abrasion Resistance | G to E | VG | G | E | G | P | F | G |
| Compression Set | G | G | G | E | F | VG | E | E |
| Resilience Cold | G | G | G | G | P | E | G | F |
| Resilience Hot | VG | VG | G | F | VG | E | E | E |
| Radiation Resistance | O | G | P | F to G | G | G | E | E |
| Impermeability to Gases | G | G | G | F | O | F | E | P |
| Acid Resistance | ||||||||
| Mild Dilute | E | E | F to G | F to P | E | E | E | O |
| Strong Concentrate | G | G | F to G | P | G | F | G | E |
| Solvent Resistance | ||||||||
| Aliphatic Hydrocarbons | P | F to G | E | P | P | P | G | E |
| Aromatic Hydrocarbons | P | P | P | P | P | P | E | E |
| Oxygenated (Ketones, etc) | G | P | P | P | G | P | F | F |
| Resistance To: | ||||||||
| Swelling in Lubricating Oil | P | G | VG | P | P | P | E | O |
| Oil and Gasoline | P | G | E | P | P | F | G | E |
| Animal Oils | F | F | E | P | F | G | E | E |
| Water Absorption | VG | G | VG | VG | VG | E | E | E |
| Oxidation | E | VG | G | F to P | E | E | O | G |
| Ozone | O | VG | F | F to P | F to G | E | O | E |
| Sunlight Aging | O | VG | P | F to P | VG | E | E | G |
| Heat Aging | VG | G | G | G to F | G | O | E | E |
| Low Temperature | VG | G | F to G | G | G | O | G | F |
| Flame | P | G | P | P | P | F | E | E |
| Vegetable Oils | F | G | G | P | F | P | E | E |
| Chlorinated Hydrocarbons | P | P | F | P | P | P to F | F | G |
Legend: O = Outstanding | E = Excellent | VG = Very Good | G = Good | F = Fair | P = Poor